[react-native] add targetContentOffset (iOS-only attribute) inside NativeScrollEvent (#51971)
[react-native] add targetContentOffset (iOS-only attribute) inside NativeScrollEvent (#51971)

* add targetContentOffset inside NativeScrollPoint

* add comment

* change comment to documentation
georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped